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Warping prediction and optimization method in aluminum alloy plate asymmetrical rolling

A technology for asynchronous rolling and alloy plates, applied in metal rolling, design optimization/simulation, contour control, etc., to achieve the effect of improving the quality of the plate shape and avoiding the transformation of rolling equipment

Active Publication Date: 2017-06-30
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention does not require any special modification of the existing rolling mill, and only needs to adjust the rolling parameters (such as plate thickness, rolling pass reduction, different speed ratio, etc.) to control the warping degree of the plate during the asynchronous rolling process and give The solution to the warping problem

Method used

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  • Warping prediction and optimization method in aluminum alloy plate asymmetrical rolling
  • Warping prediction and optimization method in aluminum alloy plate asymmetrical rolling
  • Warping prediction and optimization method in aluminum alloy plate asymmetrical rolling

Examples

Experimental program
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Effect test

Embodiment 1

[0055] In order to improve or solve the warping problem of asynchronously rolled aluminum alloy medium and thick plates, firstly, a two-dimensional plane strain model of asynchronous rolling was established by using finite element simulation analysis software (such as figure 2 shown), specifically include the following steps:

[0056] Step 1. Establishment of geometric and material models: the upper and lower rolls in the model are simplified to an ideal rigid-plastic model, the diameter of the upper and lower rolls is 400mm, the speed of the upper roll is 1m / s, and the speed of the lower roll is 1.2m / s, corresponding to different speeds Ratio is 1.2; Define the material performance parameter of rolling plate in the simulation process, as the specific heat of material under different temperature conditions, thermal conductivity, Poisson's ratio etc. , etc. Finite element simulation of aluminum alloy thick plate quenching residual stress and its influence on processing deforma...

Embodiment 2

[0067] A 7050 aluminum alloy plate with an initial thickness of 40 mm was used to carry out experimental rolling using the non-warping asynchronous rolling process simulated in the present invention, and the experimental rolling parameters were the same as those set in the simulation. After obtaining the experimental rolled plate, measure the warpage curvature of the rolled plate, the measured value is as follows Figure 5 shown. Compared with the simulation results, the measured critical reduction is basically consistent with the simulation results, indicating that the above method can accurately and reliably predict the warpage of 7050 aluminum alloy plate under different asynchronous rolling conditions.

[0068] Table 1 further shows the simulated calculation results and experimental results of the plate thickness and critical pass reduction of the 40mm thick 7050 aluminum alloy plate under the condition of different speed ratio of 1.2 after different passes of asynchronous...

Embodiment 3

[0070]The above examples prove that asynchronous rolling without warpage can be achieved by using the critical pass reduction method. However, due to the limitation of the rolling capacity of the rolling mill in actual production, not all initial thicknesses can pass the above critical pass reduction. method to achieve warpage optimization. Therefore, it is necessary to obtain the maximum rollable initial plate thickness that can achieve warpage optimization by using the critical pass reduction method based on the common rolling mill equipment conditions in the existing industrial production. According to the rolling bite condition, the relationship between the bite angle (α) and the friction coefficient (μ) needs to be satisfied: αmax and maximum bite angle α max There is a relationship between: Δh max =2R(1-cosα max ). Using the friction coefficient 0.35 given above and the work roll radius 600mm to calculate, it can be known that the maximum reduction Δh that the rolling...

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Abstract

The invention belongs to the field of metal material machining and discloses a warping prediction and optimization method in the aluminum alloy plate asymmetrical rolling process. Through the warping prediction and optimization method, warping of a asymmetrical rolled plate can be reduced significantly or eliminated completely, special transformation does not need to be conducted on an existing rolling mill, and the warping degree of the plate during asymmetrical rolling can be controlled and warping is given only by adjusting rolling parameters such as plate thickness, rolling pass rolling reduction and a different speed ratio. The warping prediction and optimization method has the advantages that based on the analogue simulation asymmetrical rolling process and through combination with an actual rolling experiment, analysis of an aluminum alloy plate asymmetrical rolling non-warping process is conducted, the warping direction of the asymmetrical rolled plate under the condition of actual working conditions can be known, the operation state of the asymmetrical rolled plate is judged and determined, and a visual scheme is provided for the actual process adjustment; and based on analogue simulation, the rolling process parameters (such as the pass rolling reduction) achieving zero warping of the asymmetrical rolled plate are obtained first in advance, the plate quality can be improved significantly, and transformation of rolling equipment or adding of a forced straightener is avoided.

Description

technical field [0001] The invention discloses a warpage prediction and optimization method in the process of asynchronous rolling of aluminum alloy plates, which can significantly reduce or completely eliminate the warpage of asynchronous rolling plates, and belongs to the field of metal material processing. Background technique [0002] High-performance aluminum alloy (such as Al-Zn-Mg-Cu series) medium-thick plate is widely used in the manufacture of fuselage frames and bulkheads due to its excellent specific strength, corrosion resistance, toughness and fatigue resistance, and has become an important important aeronautical structural materials. The traditional hot rolling process is currently the main processing method for preparing such high-strength and tough aluminum alloy plate, but there is a common problem of uneven deformation along the thickness direction of the plate in the process of producing plate by this process, which eventually leads to microstructure in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B3/00B21B1/26B21B37/28G06F17/50
CPCB21B1/26B21B3/00B21B37/28B21B2003/001G06F30/17G06F30/20
Inventor 侯陇刚马存强张济山庄林忠
Owner UNIV OF SCI & TECH BEIJING
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